Mean posterior 8–13 Hz log power has higher reliability over one month than the arithmetic minus music contrast in 56 healthy adults under recorded orders

We compared two posterior alpha scores across one month. Alpha is EEG power in the 8–13 Hz band. We used public EEG records from OpenNeuro ds004148 version 1.0.1. We retrieved all 240 specified records for 60 healthy adults. The fixed window rules retained 56 adults. Both mental arithmetic and music imagery used closed eyes. We compared mean 8–13 Hz task log power, M, with arithmetic minus music log power, D. The intraclass correlation coefficient (ICC) measures agreement between visits. ICC was 0.828 for M and 0.173 for D. The paired ICC difference was 0.655. Its 95 percent bootstrap interval was 0.369 to 0.905. The mean task score had greater absolute-agreement reliability than the task difference score in this cohort. Task orders changed between visits. The planned order adjustment could not be estimated. The result cannot separate task effects from order effects. The package preserves all new window spectra from 238 decodable records, source hashes, retrieval records, code, results, and reproduction checks. The result applies to these tasks, this cohort, these recorded orders, and this method.

EEG · test-retest reliability · alpha power · mental arithmetic · music imagery · intraclass correlation · difference scores